Synonyms|43Antonyms|5|Broader|0Narrower|0Related|46
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jet plane(expression, idiom, ship)
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motionless
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mute
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noiseless
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placid
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private aviation(expression, idiom, ship)
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private plane(expression, idiom, ship)
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prop-jet
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propeller plane(expression, idiom, ship)
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quiet
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reticent
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rocket plane(expression, idiom, ship)
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serene
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silent
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soundless
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speechless
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spy plane(expression, idiom, ship)
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static
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subsonic speed(expression, idiom)
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supersonic aircraft(expression, idiom, ship)
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APASmart Define. (2015). subsonic thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/subsonic/thesaurus/synonyms
ChicagoSmart Define. 2015. "subsonic thesaurus" https://smartdefine.org/subsonic/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, subsonic thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/subsonic/thesaurus/synonyms>.
MLASmart Define. "subsonic thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/subsonic/thesaurus/synonyms>